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I am going to guess that Ace is also most expensive since it is the one that gets the nod for dyno specs from everyone. The difference in performance from one similarly configured header to another of same quality wouldn't be massive on well designed products from given suppliers. Most people have some budget for their purchase and headers for the twins range from a couple hundo on Ebay up to (apparently) $1600+ USD. Six years ago I purchased a Revworks UEL which I like and the tiny peak power tradeoff for the UEL is really just sticking to the boxer tradition. I can recognize a UEL rumble coming down the block and it is distinct. A 20 HP increase with EL, I'm very skeptical and again it's the area under the curve, especially the torque dip that counts for most people. My only warning is there are no heat shields on aftermarket headers, and I never had mine heat coated. Last year I wrapped the headers (difficult job) but by nature of the intake position on the HKS V1 intake I am still plagued with high intake temps when in slow traffic. I just never use the car for driving in heavy traffic.
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5:AD kit, HKS V1+ S/C, ECUtek dyno'd, Ohlins MP20, Magnaflow cb, Revworks UEL, Topspeed overpipe, Pinnacle Ceramic tint, VG shark fin, HID's, yellow DRL's, full LEDs, red floor lights, Homelink mirror, trunk lid liner, Perrin LWCP, Valenti smoked, Flossy Grip Tape Shorty, GT86 plaque, lighted vanity mirror, Michelin PSS, Project mU +800, DOT4 fluid, 720 Form GTF1 17x8&9, stitched leather bits, EZ valve.
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